摘要
为便于研究紊流风特性参数对不同结构风洞试验结果的影响,采用风洞试验方法,通过对不同形式的格栅形成的局部紊流风场参数进行测试,总结格栅条间距、格栅条宽度对风洞不同断面紊流强度、紊流积分尺度及脉动风功率谱的影响规律。研究结果表明:距离格栅3.5 m处的横截面即可形成均匀性较好的局部紊流风场。格栅产生的紊流强度随风速变化不大。格栅越窄,紊流强度越低,数据的稳定性越好。紊流积分尺度与格栅间距大致相当。给出了依据格栅间距与格栅宽度估算紊流强度与紊流积分尺度的公式,便于局部紊流风场调试。
For studying the effects of turbulence characteristic parameters on the wind tunnel test results of different structures,the parameters of local turbulent wind field produced by different grille shapes were measured and the influences of the distance between two grilles and the widths of grilles on the turbulence intensity,turbulence integral scale and fluctuating wind power spectra at different cross section were analysed by means of wind tunnel tests.The results show that the local turbulent wind field with good uniformity can be developed at the cross section 3.5 meters away from grilles. The turbulence intensity generated by grilles changes little with the change of wind velocity.Smaller widths of grilles and lower turbulence intensity can make better the stability of data.The size of turbulence integral scale is nearly the same as the distance between the two grilles.To facilitate the local turbulent wind adjustment,the estimation formula for turbulence intensity and turbulence integral scale according to the width and space of grilles was provided.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第22期209-214,共6页
Journal of Vibration and Shock
基金
中国博士后科学基金项目(2014M560737)
中国博士后科学基金特别资助项目(2016T90876)
西安理工大学科学研究计划项目(2015CX017)
中央高校基本科研业务费专项资金项目(0009-2014G1211005
0009-2014G1211006)
关键词
桥梁工程
风洞试验
格栅
紊流
风特性参数
bridge engineering
wind tunnel test
grille
turbulence
wind characteristic parameters
